Russia's state-controlled gas company Gazprom CEO Alexei Miller, left, shakes hands with Russian President Dmitry Medvedev, right, after signing an agreement with Chairman of German natural-gas utility E.ON Rurhgas AG, Bernhard Reutersberg, not seen, at an investment forum in St. Petersburg, Russia on June 5, 2009. E.ON Rurhgas AG said it has signed a deal to complete the acquisition of a 25 percent stake in the Siberian Yuzhno Russkoye gas field from Gazprom OAO, wrapping up more than four years of preparation to co-own the strategic asset.